MacMall has the Mac OS X v10.5.4 Leopard for $103.94 After $6 Mail-In Rebate. Free Shipping. Mac OS X v10.5.4 Leopard is packed with over 300 new features. Improvements have been included for all your favorite Mac programs like iChat and Mail, as well as all-new features such as Quick Look, and Time Machine, which can recover files in seconds.